Pdflatex - "includegraphics" command

My Latex documentation tells me that I can include a picture file in a document with the \includegraphics{filename} command.

However, using this command causes pdflatex to fail with

“! Undefined control sequence.”

Does someone here know more about the version of Latex DH has installed, and what it can/can’t do?

Okay, never mind. Apparently, the “graphicx” package is enabled by default in my usual latex environment, but not on the DH server, so I have to include \usepackage{graphicx} first.